Actually that would be quite valuable, if you could adapt your knowledge enough. Someone needs to design the garages, living spaces, and laboratories that the colonists use, with materials requirements, comfort, and safety all working against each other. It could be quite challenging. On the other hand you could probably do it from Earth, but you'd miss out on some insight into people's reactions to your designs.
There might be a contradiction in the setting of $10 per pound and effective fusion techs. When it drops to that cheap, it means the infrastructures of energy conversion is becomes so abundant that either fusion has already got a reliable fuel source, or other means of energy conversion already to cheap to consider using fusion instead. (Which fusion haven't already be commercialized so needs to find cheap fuel)
If a Mars mission is being sent, we might already have developed infrastructure on the moon to produce the necessary fuel. That, in my mind, is the sanest option. A lunar space elevator would be considerably less risky to operate, require less advanced materials, and allow for larger payloads as well. Honestly, my prediction is that we'll see very large solar arrays constructed on the moon powering vasmir engines for the first sizable colony vehicles. They'll still take a long time to get there, but it gives you better failure options than fusion, since it's a much less complicated power source. You'd spend a lot of your transport costs on bringing your colonists to the lunar facility, and very little on the actual trip there. It would be a bulk payoff, because with larger ships you can send more construction materials to get the colony off to a good start.
As for the moon base itself, the costs for sending the fuel back down would be modest with even a minimal rail-launch system. Even with very low efficiency solar, you've got all the real-estate you could possibly want to set up an array to power it. You'd have to design an unmanned shipping container, cheap, disposable, probably made of ceramic composites with a small iron rail for the track. It wouldn't need to go very fast on the trip back, since you'd be sending the containers in a steady stream. Even if it was just something that had decent buoyancy and a very small chute - the capsules designed for splashdown needed to be more advanced because people can't really survive the sudden impact this would require, even against water, but maybe some kind of ablative system to transfer the energy away from the payload's weaker sections... There's a lot of things to consider, like getting enough metal production for pressurized He3 containers, but I don't think it's as troublesome or costly as politicians try to make it seem sometimes.